After the mysterious creature rises from the depths of Gray Lake and disappears into the surrounding forest, Sheriff Lila Grant and Elias Ward realize that the drained lake was only a prison that kept something ancient contained for centuries. As the town of Briar Glen struggles to understand what they witnessed, the two race to uncover the truth behind the hollow beneath the lake before the creature reaches the outside world. What once slept silently beneath the water is now free, and its awakening may bring a catastrophe far beyond the small valley.
